Siemens SINUMERIK 840D sl Function Manual page 435

4. Activate the learning phase by starting this NC program. The compensation characteristic
5. Activation of the injection of the compensation values for the required axes with machine
6. Parameterize the trace for the circularity test in the menu "Circularity test measurement"
7. Start the NC program with test motion (circle). The actual position values during the
8. Check the quadrant transitions for the contour recorded.
9. Depending on the result, repeat items 2, 4, 7, 8 and 9 if necessary. It might be necessary
10. The compensation characteristics must be saved as soon as the contour precision meets
11. If necessary, the memory area previously reserved for the compensation values can be
"Relearning"sequence
"Relearning" -> cycle parameters "Learning mode" = 1
"Relearning" can be used to perform a simple, automatic re-optimization process on
previously learned characteristics. The values already in the user memory are taken as the
basis.
The reference NC programs adapted to the machine (e.g. from "initial learning") must be
used in the learning phase for "relearning". Generally, the previous values of the QEC
system variables can still be used. Before the learning cycle is called, the parameter
"learning mode" must be set to 1 (meaning "relearning"). It might also be used to reduce the
"number of training passes".
Extended Functions
Function Manual, 09/2009, 6FC5397-1BP20-0BA0
is learned simultaneously for all parameterized axes. The learning duration depends on
the specified learning parameters. If default values are used, it can take several minutes.
The status of the axes concerned can be observed in the service display "axis" in the
display "QEC learning active".
data setting:
MD32500 $MA_FRICT_COMP_ENABLE = 1(friction compensation active).
(with HMI Advanced or commissioning tool). Parameter values for reference NC program:
Radius[mm]:
Feedrate[mm/min].
After this, enable the measuring function with the vertical softkey "Start".
circular movement are recorded and stored in the passive file system. After termination of
data recording, the recorded contour is displayed as a diagram.
to change certain QEC system variables first (see also Section "Learning the neural
network").
the requirements (see Section "Learning the neural network").
reduced to the memory actually required.
NOTICE
When the machine data below is altered, the non-volatile user memory is automatically
re-allocated on system power-on.
MD38010 $MA_MM_QEC_MAX_POINTS
(number of values for quadrant-error compensation with neural network)
All the user data in the non-volatile user memory are lost. These data must therefore be
backed up first. After power-on of the control, the backed up characteristics must be
loaded again.
5.6 Friction compensation (quadrant error compensation)
K3: Compensation
435